نتایج جستجو برای: goldfish

تعداد نتایج: 2514  

Journal: :Diseases of aquatic organisms 2009
Janicke Nordgreen Hanne Hustoft Kolsrud Birgit Ranheim Tor Einar Horsberg

Teleost fish have a nociceptive system and likely perceive pain. This warrants the development of analgesic protocols both for experimental surgery and for various husbandry procedures. Morphine is the standard analgesic against which the efficacy of other analgesics is assessed, and is the analgesic that has been most used in fish. The aims of this study were to describe the pharmacokinetics o...

Journal: :The Journal of experimental biology 2017
Matthew D Regan Ivan S Gill Jeffrey G Richards

Metabolic rate depression (MRD) has long been proposed as the key metabolic strategy of hypoxic survival, but surprisingly, the effects of changes in hypoxic O2 tensions (PwO2 ) on MRD are largely unexplored. We simultaneously measured the O2 consumption rate (ṀO2 ) and metabolic heat of goldfish using calorespirometry to test the hypothesis that MRD is employed at hypoxic PwO2  values and init...

Journal: :General and comparative endocrinology 2016
Ratna Ghosal Peter W Sorensen

Male-typical reproductive behaviors vary greatly between different species of fishes with androgens playing a variety of roles that appear especially important in the gonochorist cypriniform fishes. The goldfish is an important model for the cypriniformes and while it is clear that male goldfish are fully feminized by prostaglandin F2α(PGF2α), it is not clear whether females will exhibit normal...

2014
Xiaona Zhang Hua Tian Wei Wang Shaoguo Ru Vincent Laudet

Our recent study showed that monocrotophos (MCP) pesticide disrupted the hypothalamic-pituitary-thyroid (HPT) axis in male goldfish (Carassius auratus); however, the effects of MCP on the thyroid system in female goldfish are remain unclear. In the present study, plasma thyroid hormone (TH) and thyroid-stimulating hormone (TSH) levels were evaluated in female goldfish exposed to 0.01, 0.10, and...

Journal: :The Journal of experimental biology 2010
Claus Lunde Pedersen Serena Faggiano Signe Helbo Hans Gesser Angela Fago

The roles of nitric oxide synthase activity (NOS), nitrite and myoglobin (Mb) in the regulation of myocardial function during hypoxia were examined in trout and goldfish, a hypoxia-intolerant and hypoxia-tolerant species, respectively. We measured the effect of NOS inhibition, adrenaline and nitrite on the O(2) consumption rate and isometric twitch force development in electrically paced ventri...

Journal: :The Journal of Experimental Biology 2021

ABSTRACT Goldfish are one of a few species able to avoid cellular damage during month-long periods in severely hypoxic environments. By suppressing action potentials excitatory glutamatergic neurons, the goldfish brain decreases its overall energy expenditure. Coincident with reductions O2 availability is natural decrease reactive oxygen (ROS) generation, which has been proposed function as par...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 1989
P S Jones P Tesser J Borchert N Schechter

The expression of the neurofilament proteins of the goldfish visual pathway reflects the degeneration and regeneration of the optic nerve after nerve crush. To monitor these processes, monoclonal antibodies (mAb) were generated to the intermediate filament proteins of this pathway. The predominant goldfish visual pathway intermediate filament proteins have a molecular weight of 58K and can be s...

2012
Man-Tat Lau Sze-Wah Lin Wei Ge

As an essential hormone regulating gonads in vertebrates, the biosynthesis and secretion of follicle-stimulating hormone (FSH) is controlled by a variety of endocrine and paracrine factors in both mammalian and non-mammalian vertebrates. Activin was initially discovered in the ovary for its specific stimulation of FSH secretion by the pituitary cells. Our earlier studies in fish have shown that...

Journal: :The Journal of experimental biology 2017
Nariman Hossein-Javaheri Michael P Wilkie Wudu E Lado Leslie T Buck

With oxygen deprivation, the mammalian brain undergoes hyper-activity and neuronal death while this does not occur in the anoxia-tolerant goldfish (Carassius auratus). Anoxic survival of the goldfish may rely on neuromodulatory mechanisms to suppress neuronal hyper-excitability. As γ-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the brain, we decided to investigate its po...

Journal: :Vision Research 1999
T. Sjoerdsma M. Kamermans H. Spekreijse

In goldfish it has been shown that ethambutol shifts the threshold for wavelength discrimination without affecting the absolute sensitivity of the cones. In this study we demonstrate that a similar colour vision disturbance occurs in tuberculosis patients treated with ethambutol. After 2 months of ethambutol treatment, chromatic discrimination was measured with a computerized forced two choice ...

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